Electric-arc lamp.



. No. 660,795. Patented Oct. 30, I900.

C. E. HARTHAN &. G. E. STEVENS.-

ELECTFHC ARE LAMP.

(Application yfiled. Nov. 2 1898.)

(No Model.)

UNITED STATES PATENT OFFICE.

CHARLES E. I-IARTHAN AND GEORGE E. STEVENS, OF LYNN, MASSACHU- SETTS, ASSIGNORS TO THE GENERAL ELECTRIC COMPANY, OF NEW YORK.

ELECTRlC-ARC LAM P.

SPECIFICATION forming part of Letters Patent No. 660,795, dated October 30, 1900.

Application filed November 2, 1898. Serial No. 695,268. (No model.)

To all whom it may concern.-

Be it known that we, CHARLES E. HARTHAN and GEORGE E. STEVENS, citizens of the United States, residing at Lynn, in the county of Essex, State of Massachusetts, have invented certain new and useful Improvements in Electric-Arc Lamps, (Case No. 955,) of which the following is a specification.

Our invention relates to electric-arc lamps, and more particularly to those of what is commonly known as the inclosed type; and it consists in the parts and combination of parts, as hereinafter described and claimed, designed and arranged to improve the construction and operation of the lamps.

In the accompanying drawings, which illustrate an embodiment of our invention, Figure l is a front elevation, partly in section, of the globe-supporting devices of an arc-lamp. Fig. 2 is a detail. Fig. 3 is a cross-section of the yoke and holder, and Fig. 4 is an enlarged detail.

Extending downward from the base 0 are the side tubes A and B, and connecting these tubes at the lower end is a spring-supported yoke D; Mounted for vertical movement within the tubes are the globe-carrying rods E and F, which are connected by the crossbar G. Secured to and extending downwardly from the cross-piece G is a screwthreaded stud H, and mounted upon the stud is the outer globe-holder I. No means are shown for locking the rods E and F in their raised position, but it is to be understood that they will be secured in the ordinary manner. Adjustably mounted on the side tubes at a point below the base and insulated therefrom is a flat metal plate or cap J, which is provided in the center with a device K for preventing the free entrance and exit of air to the cylinder or globe L. On the ends of the plate or cap are sleeves J,-which are insulated therefrom by insulating-bushings M, and mounted within the sleeves are metal linings N, which surround the tubes A and B. The plate J may be adjusted upon the tubes by releasing the screws J which are mounted in bosses formed on the sleeves. It is not intended, however, to adjust the plate or cap each time a cylinder L is inserted, but

only when cylinders of different heights are used.

The yoke D is provided with two cup-like cavities on the top side for the reception of the side tubes A and B, and situated directly below these cavities are other cavities, each being somewhat larger than those first mentioned and containing a securing-screw O and a coiled compression-spring P. The screws 0 are somewhat large and are bored out, as shown in Fig. l, to permit the globe-supporting rods to pass freely through them, and their heads act as shoulders, against which the springs abut. With this arrangement the yoke D always presses the cylinder L upward against the under side of the plate J and is capable of a slight movement independentof the side tubes. The yoke D forms a seat for the cylinder-support L and is provided with a straight bore D and a conical bore D to receive the conical or tapered portion L of the cylinder-support L, and between the two parts is a metal bushing L serving to increase the conductivity between the lower carbon P and the yoke D. The yoke is cut away 011 the front side, as shown at D in Fig. 2, so that by separating the supportor cylinder-holder L and the yokeas, for example, by depressing the yoke by handthe cylinder-holder may be moved bodily to the front and removed together with the cylinder L and the lower carbon. The shape of the parts is such that the holder cannot by any chance slip out sidewise in the normal action of the lamp; but when the parts are separated by a sufficient distance the cylindrical part on the lower end of the holder will slip sidewise through the opening D Mounted within the cylinder-support in any suitable holder is the lower carbon P, and in the present instance a thumb-screw Q is employed to permit the centering of the carbon and also to establish good conductivity between the holder and the carbon.

No special clamping means are employed to hold the cylinder either at the top or bottom. The bottom is seated on a bed or packing Z, of asbestos, and is held from moving eccentrically with respect to the carbon by the upturned flange Z on the holder. This is a very simple arrangement and permits of the ready removal and substitution of a new carbon and cylinder.

If desired, the cylinders may be cleaned at the station and carbons placed in the holders, so that the operation of trimming a lamp may consist only in inserting a new upper carbon and slipping in a new cylinder.

The upper carbon P is mounted within the carbon Lube Pt and projects downward through the plate or cap J into the cylinder L and in retrimming is pushed upward through the yoke D. To permit this insertion and also to strengthen the yoke, a iiat web D is formed integral with the yoke. This web is provided with a central opening, through which the carbon can be passed from the under side of the lamp. Mounted on the lower end of the tube R is a clutch S, which grips the upper carbon and controls its feed. The clutcharms are arranged to strike on the plate J, which acts as a tripping-platform.

Current may be conveyed to the lower carbon through the side tubes, or a separate connection may be employed which connects with the lower-carbon holder, in which case the latter would preferably be insulated from the yoke D.

What we claim as new, and desire to secure by Letters Patent of the United States, is

1. In an electric-arc lamp, the combination of a base, downweirdly-extending side rods, a yoke, coiled springs for supporting the yoke on the ends of the rods in such a manner that it is vertically movable, an arc-inclosing cylinder, a holder therefor which is carried by the yoke, and a cap for closing one end of the cylinder, which cap is mounted on the side rods and is capable of being adjust-ed vertically thereon.

2. In anelectric-arc lamp, the combination of a base, a pair of downwardly-extending side rods secured thereto, a yoke connecting the side rods at the lower ends, the said yoke being provided with an opening for receiving the cylinder-holder, an arc-inclosing cylinder, a holder therefor which fits into the opening in the yoke, a cap which is carried by the side rods and is adjustable thereon, and coiled springs which press the yoke upward at all times.

3. In an electric-arc lamp, the combination of a tubular side rod, a yoke which is movable thereon, an arc-inclosing cylinder, a cap therefor mounted on the side rod and capable of vertical adjustment, a holder for the cylinder, a seat in the yoke for the holder, and a coiled spring surrounding the side rod and tending at all times to press the cap and yoke together.

4. In an electric-arc lamp, the combination of a pair of tubular side rods, a yoke connecting the rods, Which is provided with cupshaped cavities on the upper side for receiving the ends of the rods and with similar cavities on the under side thereof, means for securing the yoke to the rods, and springs for permitting a slight movement of the yoke in dependent of the rods.

5. I11 a lamp, the combination of a pair of side rods rigidly fixed to the frame, a springsupported yoke connecting the rods at the bottom and provided with aseat which has a lateral opening at one point, a fixed top or cap for the cylinder, and a holder for the cylinder which fits into the seat in the yoke and is removable by depressing the yoke and moving it through the lateral opening.

6. In a lamp, the combination of a pair of side rods, a spring-supported yoke connecting the rods and provided with a seat having a straight and conical bore, the said seat being laterally cut away at one point, a cylinder, and a holder therefor having a base formed to fit the seat in the yoke, which is removable by depressing the yoke and moving it through the lateral cutaway portion.

'7. As an article of manufacture, a yoke for an electric-arc lamp, having top and bottom cup-shaped cavities at each end, a combined straight and conical bored seat which is cut away at one point, and a flat web situated below the seat and provided with an opening to permit a carbon to be passed upward through the yoke.

8. In an electric-arc lamp, the combination of a pair of tubular side rods, a yoke connecting the rods, screws threaded to the lower ends of the rods, and compression-springs surrounding the screws and arranged to force the yoke upward against the ends of the side rods.

9. In a lamp, the combination of a pair of side rods, a spring-supported yoke connecting the rods, a cylinder, a fixed cap, and a seat for the lower end of the cylinder, which is provided with an opening on one side, the arrangement of parts being such that the cylinder can be removed only by depressing the yoke and removing the lower end of the cylinder through the opening in the seat.

10. In an electric-arc lamp, the combination of an inner globe or cylinder which is open at both ends, a cap or cover for the top, side rods secured to the frame, a yielding yoke mounted on the side rods supporting the lower end of the cylinder-rests, and means for pressing the cap and holder against the ends of the cylinder to hold the latter in place.

11. In an electric-arc lamp, the combination of a pair of side rods, a yoke having a central opening with a conical surface and a laterally-extending slot communicating with said opening, which yoke connects the side rods, screw-threaded means for retaining the yoke in place, a combined globe and carbonholder arranged to fit the conical surface on said yoke and be removable by a sidewise movement through the laterally-extending slot, and a spring for holding the said holder in place.

12. In an electric-arc lamp, the combination of side rods, a yoke for connecting the rods, the said yoke being provided with a cena spring for pressing the yoke and holder to Ward each other and aholder mounted on the yoke and adapted to fit into the seat, the seat and groove being so arranged that by raising the holder slightly the latter may be removed by a lateral movement.

In witness whereof We have hereunto set our hands this 28th day of October, 1898.

CHARLES E. HARTHAN. GEORGE E. STEVENS. WVitnesses:

HENRY O. WESTENDARP, DUGALD McKILLoP. 

